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To take one extreme example: the implicit levelised cost of nuclear in the model, is less than the value of exports.
Which means that in any scenario, you can decrease the total cost to UK plc, by building surplus nukes. Nukes for power export are programmed to represent net cash earners, effectively having negative whole system cost.
There are several reasons for this. Insurance costs are included for renewables, but not for nuclear. Nuclear central costs and plausible build rates are very optimistic. So levelised cost comes out at under 7p/kWh. And the value of exports is set at 7.32p/kWh. (cells F99-O99, sheet VII.a)
As to economies of scale, well, that's a matter of faith. The French showed diseconomies of scale, and there are good reasons to believe that a large new British nuclear programme would experience the same. Still, as such a thing isn't going to happen, it doesn't really matter.
As to cables to non-nuclear or nuclear-minority neighbours, Britain already has interconnectors to Ireland and to the Netherlands. Survey work for the putative new one to Norway is happening now. By the time the proposed Belgium interconnector gets built, Belgium will be non-nuclear or minority-nuclear. And should Britain genuinely try to build, say, 10GW of new nukes, then by the time they were commissioned, France may well be a minority-nuclear country too.
Biomass power plants burn coal, apparently. Also, liquid biofuel from biomass is apparently code for coal-to-liquids.
Decreasing livestock numbers increases oil imports! Obvious, really; biomethane etc fuels not only all the tractors and trucks to transport feed etc involved in animal husbandry, but a significant portion of the general vehicle fleet : really?
It is rightly acknowledged that people of faith have no monopoly of virtue
- Queen Elizabeth II
better would be electric tractors...
'The history of public debt is full of irony. It rarely follows our ideas of order and justice.' Thomas Piketty
Yeah, that's a silly thing. Solid-fuel plants are all much of a muchness in the model. So if you don't allocate enough biomass production / imports, then rather than scaling down the solid-fuel plant capacity factor, it just uses coal instead. That's fixable. I'd add it to my TODO list.
It's not an economic simulator. It's a scenario simulator.
So if the user specifies N amount of biofuel plant in their scenario, that's what they should get. That's just a matter of good UX design.
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